JP2999327B2 - Mold removal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold attaching / detaching apparatus for attaching / detaching a mold to / from a mold attaching portion of an injection molding machine or the like.

[0002]

2. Description of the Related Art In an injection molding machine, for example, a mold attaching / detaching device S is provided at a mold attaching portion R of a movable plate P and a fixed plate Q as shown in FIG. Mold M
Has been removed.

[0003] Conventionally, there is an apparatus shown in FIG. The mold attaching / detaching device 60 includes a main body 62 fixed to a mold attaching portion R of the movable plate and the fixed plate,
It comprises a clamp member 64 housed in the main body 62 so as to be able to move back and forth, and a driving device 66 for moving the clamp member 64 back and forth. The front side of the front part of the clamp member 64, that is, the mold mounting portion R side. The mold engaging portion 68 has a tapered surface.

[0004] The mounting of the mold by the mold attaching / detaching device is as follows.
This is performed by moving the clamp member 64 forward by the operation of the driving device 66 and clamping the mold substrate N between the mold engaging portion 68 and the mold mounting portion R of the clamp member 64. At this time, since the mold engaging portion 68 has a tapered surface, the front end of the clamp member 64 slides on the surface of the mold substrate N without hitting the end of the mold substrate N. The removal of the mold is performed by retreating the clamp member 64 by the operation of the driving device 66 to release the clamping of the mold substrate N.

[0005]

However, it is not easy to form the surface of the mold substrate N so as to match the tapered surface of the mold engaging portion 68. The surface of the substrate N is often in line contact. Therefore, when the clamp member 64 moves back and forth when the mold is attached and detached, a large force is concentrated on the line contact portion between the tapered surface of the mold engaging portion 68 and the surface of the mold substrate N, and a so-called galling phenomenon occurs. As a result, the back-and-forth movement of the clamp member 64 is hindered, making it difficult to attach or detach the mold, or the tapered surface of the mold engaging portion 68 or the mold substrate N may be damaged. Therefore, the present invention provides a mold which can securely attach and detach a mold even when the surface of the mold substrate does not exactly match the surface of the mold engaging portion of the clamp member, and which does not damage the clamp member and the mold substrate. It is intended to provide a mold attaching / detaching device.

[0006]

According to the present invention, there is provided a main body fixed to a mold mounting portion, and the main body is always urged forward so as to be able to move back and forth while defining a most advanced position in the main body, and is opened and closed. A clamp member that is movably supported by being constantly biased in the rear direction, has a mold engaging portion for a mounted mold on the front front side, and has a rear side formed by a tapered surface; The clamp is supported in the main body so as to be movable back and forth by a driving device, has a tapered surface corresponding to the tapered surface of the clamp member, and has a sliding contact surface that slides on the tapered surface of the clamp member. An operating member having an engaging portion that is rotatably provided and engages with the clamp member to move back and forth, and when the operating member moves forward, the clamp member that has been advanced moves through the meniscus pin. Positive By pressing in the lateral direction, the mold engaging portion of the clamp member is closed, and when the operating member is retracted, the mold engaging portion of the clamp member is opened and the clamp member is retracted. And a mold attaching / detaching device.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments.
1 and 2 are perspective views of a mold attaching / detaching device 10 according to an embodiment of the present invention, with a part of a main body removed and viewed from the front side. FIG. FIG. 4 is an enlarged cross-sectional view of a main part of FIG. 3, FIG. 5 is a cross-sectional view showing a state in which a mold is being mounted, FIG. 6 is an enlarged cross-sectional view of a main part of FIG.
FIG. 4 is a cross-sectional view showing a state after the mold is mounted. In the drawings, a is the front side (front direction) of the mold attaching / detaching device, b is the back side (back direction), and c is the front side (front direction).

The mold attaching / detaching device 10 has a main body 12, a clamp member 14, an operating member 16, a driving device 18, and a half moon pin 20 as main members. The main body 12 has a box shape with an open front, and has a clamp member 14 therein.
Each member such as the operating member 16 is housed and fixed to a mold mounting portion R of the injection molding machine or the like with a bolt or the like. The front side a of the main body 12 in contact with the mold mounting portion R is opened, and the front side a of the clamp member 14 is directly connected to the mold mounting portion R.
May be faced.

The clamp member 14 has a die engaging portion 24 cut out in a substantially right-angle cross section on the front side a of the front part, and the rear side b reduces the thickness of the clamp member 14 from the front part to the rear part. The tapered surface 26 is reduced. The tapered surface 26 has an elliptical concave portion 30 that engages with an engaging portion 42 of the operating member 16 described later with play provided in front and rear. A ball plunger 32 composed of a compressed spring and a ball at the tip thereof is embedded in the front side a of the clamp member 14, and the clamp member 14 is urged toward the rear side b by the ball plunger 32. The clamp member 14 is always urged forward by a spring 34 disposed at the rear, and the rear is axially attached to the tip of a slide bar 36 with a pin 35, and is rotatable to the rear side b.

The slide bar 36 is accommodated in the main body 12 so as to be slidable back and forth, and a clamp member 14 is provided at a rear portion.
Position sensor 3 for detecting the forward and backward positions of the vehicle
8 The position sensor 38 detects the position of the mold engaging portion 2 of the clamp member 14 when the mold is mounted in the retracted position.
4 to confirm that the mold engaging portion 24 of the clamp member 14 is closed after attaching the mold at the forward position. .

The operating member 16 has a tapered surface 40 corresponding to the tapered surface 26 of the clamp member 14 on the front side a. The rotatable meniscus pin 20 is provided on the tapered surface 40,
A pin-shaped engaging portion 42 that engages with the concave portion 30 of the clamp member 14 is provided. The pin-shaped engaging portion 42
In the first embodiment, the engaging action is exerted only when the operating member 16 slides back and forth with respect to the clamp member 14 and the engaging portion 42 reaches the front end or the rear end in the recess 30. The operating member 16 is connected at the rear to a piston 44 of the driving device 18 composed of a cylinder device so that the operating member 16 moves forward and backward by the forward and backward movement of the piston 44, and a compression member disposed at the rear of the operating member 16. It is constantly urged forward c by the spring 46 in the state.

The meniscus pin 20 is formed by flattening a part of the circumference of a cylindrical body, and the plane is formed by the clamp member 1.
4 constitutes a sliding contact surface 48 in sliding contact with the tapered surface 26. The meniscus pin 20 is rotatable in the front-rear direction, and the tapered surface 40 of the operating member 16 is
The operating member 16 is floated from the tapered surface 26 of the
Is fitted to the tapered surface 40. 50 is a bush, 5
2 is an O-ring. Mold attaching / detaching device 1 having the above configuration
Reference numeral 0 is fixed to the mold mounting portion R at predetermined intervals by bolts or the like, and is used for attaching and detaching the mold as follows.

At the time of mounting the mold, first, the piston 44 of the driving device 18 is retracted as shown in FIG. 3, and the operating member 16 connected to the piston 44 and the clamp member 14 engaged with the operating member 16 are attached to the main body 12. Housed inside. At this time, the pin-shaped engaging portion 42 of the operating member 16 is located at the rear end of the concave portion 30 of the tapered surface of the clamp member 14, and the operating member 16
Is located at a position shifted rearward from the clamp member 14. Due to the misalignment between the clamp member 14 and the operating member 16 and the urging of the ball plunger 32 toward the back side b, the clamp member 14 rotates a predetermined amount toward the back side b about the shaft attachment portion with the slide rod 36 as the center of rotation. Due to the rotation, the mold engaging portion 24 at the front of the clamp member 14 opens its mouth as shown in FIG.

Next, with the mold engaging portion 24 opened,
The mold substrate N is arranged at the mold mounting portion R, and FIGS.
The piston 44 of the driving device 18 is advanced as shown in FIG. Thereby, the operating member 16 connected to the piston 44,
The clamp member 14 engaged with the operating member 16 by the engaging portion 42 advances. At this time, since the clamp member 14 is constantly urged forward by the rear spring 34, the clamp member 14 is shifted forward from the operating member 16 as described above, and the mold engaging portion 24 moves forward with the mouth open. I do.

Then, the mold engaging portion 24 of the clamp member 14
Moves forward to the end of the mold substrate N, loosely sandwiches the mold substrate N between the mold mounting portion R and the pin 3 at the rear of the clamp member 14.
5 comes into contact with the wall surface of the pin 35 receiving recess in the main body 12, and the clamp member 14 stops. At that time, the mold engaging part 2
4 moves forward with the mouth open, so that the mold substrate N is sandwiched without hitting the end of the mold substrate N.

After the stop of the clamp member 14, the piston 44 of the driving device 18 is further advanced. At this time, the rear end pin 35 abuts against the wall surface of the pin 35 accommodating concave portion in the main body 12 and the forward limit of the clamp member is always restricted. Never hit. On the other hand, the operating member 16 further advances because there is a space in front of the pin-shaped engaging portion 42 in the concave portion 30. The advancement of the actuating member 16 corresponds to the operation of the crescent
Is formed in sliding contact with the tapered surface 26 of the clamp member 14 while rotating according to the inclination of the tapered surface 26 of the clamp member 14. Therefore, the sliding contact surface 48 of the meniscus pin 20 is always in surface contact with the tapered surface 26 of the clamp member 14, and smooth sliding is ensured.

As the operating member 16 advances after the clamp member 14 stops, the tapered surface 40 of the operating member 16 shifts forward from the tapered surface 26 of the clamp member 14 as shown in FIG. As a result, the clamp member 14 is pressed by the meniscus pin 20 provided on the tapered surface 40 of the operating member 16 and rotates to the front side a around the shaft attachment portion with the slide bar 36 as a rotation axis, thereby engaging the mold. The part 24 is closed and the mold substrate N is fixed to the mold mounting part R. Further, even if the drive device 18 fails after the mold is mounted, the operating member 16 is always urged forward c by the rear spring 46, so that the operating member 16 retreats during injection molding or the like. There is no danger that the mold engaging portion 24 will open.

On the other hand, when the mold is removed, the piston 44 of the driving device 18 is retracted from the advanced state of the clamp member 14 and the operating member 16 shown in FIG. 7, and the operating member 16 is retracted from the advanced position. At this time, the pin-shaped engaging portion 42
Only the actuating member 16 is retracted rearward by sliding of the meniscus pin 20 until the contact with the rear end in the recess 30. Then, the clamp member 14 is pushed by the ball plunger 32 to the rear side b and rotates, whereby the mold engaging portion 24 is opened as shown in FIGS. 5 and 6, and the clamping of the mold substrate N is released.

At this time, the retracting of the operating member 16 is performed in a state where the meniscus pin 20 on the tapered surface 40 of the operating member 16 slides on the tapered surface 26 of the clamp member 14.
Therefore, the half-moon pin 20 always comes into surface contact with the tapered surface 26 of the clamp member 14, and the smooth retreat of the operating member 16 is ensured.

Thereafter, the piston 44 of the driving device 18 is further moved.
Is retracted, and the operating member 16 and the clamp member 14 engaged with the operating member 16 are retracted as shown in FIGS. As a result, the mold engaging portion 24 of the clamp member 14
Is separated from the end of the mold substrate N, and the mold substrate N is removed from the mold mounting portion R in that state.

[0021]

According to the present invention, the clamp member moves forward and backward with the mold engaging portion opened and does not hit the end of the mold substrate. Therefore, the mold can be smoothly attached and detached without being affected by the inclination of the surface of the mold substrate when attaching and detaching the mold, and the mold substrate and the mold attaching / detaching device are not damaged. Therefore, the manufacture of the mold becomes extremely easy as compared with the conventional mold attaching / detaching apparatus. In addition, since a half-moon pin rotatably slidingly contacting the tapered surface of the clamp member is provided on the tapered surface of the operating member, there is no galling due to line contact on the tapered surface of the clamp member and the operating member when opening and closing the mold engaging portion. The opening and closing of the engaging portion does not become impossible.

[Brief description of the drawings]

FIG. 1 shows a mold attaching / detaching apparatus according to an embodiment of the present invention.
FIG. 4 is a perspective view of the main body, except for a part thereof, as viewed from a clamp member side.

FIG. 2 is a perspective view of a mold attaching / detaching apparatus in a state where a clamp member is rotated to a front side a in FIG.

FIG. 3 is a cross-sectional view of the mold attaching / detaching apparatus before the mold is attached in the embodiment.

FIG. 4 is an enlarged sectional view of a main part of FIG.

FIG. 5 is a cross-sectional view of the mold attaching / detaching device showing a state where the mold is being attached in the embodiment.

FIG. 6 is an enlarged sectional view of a main part of FIG.

FIG. 7 is a cross-sectional view of the mold attaching / detaching device showing a mold attaching state in the embodiment.

FIG. 8 is a side view of the injection molding machine.

FIG. 9 is a sectional view of a conventional mold attaching / detaching apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Die attaching / detaching apparatus 12 Main body 14 Clamp member 16 Actuating member 18 Driving device 20 Crescent pin 24 Die engaging part 26 Tapered surface of clamp member 40 Tapered surface of operating member 42 Engaging part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-238932 (JP, A) Japanese Utility Model Showa 64-27215 (JP, U) Japanese Utility Model Utility Model 2-6125 (JP, U) Japanese Utility Model Showa 58- 51835 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 33/20 B29C 33/30 B29C 45/26 B29C 45/64

Claims (1)

(57) [Claims] A main body fixed to a mold mounting portion; a main body being constantly biased forward so as to be able to move forward and backward while being restricted to a most advanced position within the main body, and being always mounted rearward so as to be capable of opening and closing. A clamp member that is biased and supported, has a mold engaging portion for a mounted mold on the front front side, and has a rear surface formed by a tapered surface; A half-moon pin is movably supported, has a tapered surface corresponding to the tapered surface of the clamp member, and a rotatable half-moon pin having a sliding contact surface slidingly contacting the tapered surface of the clamp member. And an actuating member having an engaging portion that engages with the clamp member and moves forward and backward. When the actuating member moves forward, the advancing clamp member is pressed toward the front side via the meniscus pin. In front of A mold attaching / detaching device, wherein a mold engaging portion of the clamp member is closed, and when the operating member is retracted, the mold engaging portion of the clamp member is opened and the clamp member is retracted.